/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2005 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.jaxp.validation;

import com.sun.org.apache.xerces.internal.xni.grammars.Grammar;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarDescription;
import com.sun.org.apache.xerces.internal.xni.grammars.XMLGrammarPool;

/**
 * <p>Implementation of Schema for W3C XML Schemas
 * which contains no schema components.</p>
 *
 * @author Michael Glavassevich, IBM
 * @version $Id: EmptyXMLSchema.java,v 1.6 2010-11-01 04:40:08 joehw Exp $
 */
final class EmptyXMLSchema extends AbstractXMLSchema implements XMLGrammarPool {

  /**
   * Zero length grammar array.
   */
  private static final Grammar[] ZERO_LENGTH_GRAMMAR_ARRAY = new Grammar[0];

  public EmptyXMLSchema() {
  }

    /*
     * XMLGrammarPool methods
     */

  public Grammar[] retrieveInitialGrammarSet(String grammarType) {
    return ZERO_LENGTH_GRAMMAR_ARRAY;
  }

  public void cacheGrammars(String grammarType, Grammar[] grammars) {
  }

  public Grammar retrieveGrammar(XMLGrammarDescription desc) {
    return null;
  }

  public void lockPool() {
  }

  public void unlockPool() {
  }

  public void clear() {
  }

    /*
     * XSGrammarPoolContainer methods
     */

  public XMLGrammarPool getGrammarPool() {
    return this;
  }

  public boolean isFullyComposed() {
    return true;
  }

} // EmptyXMLSchema
